BITX on other bands (was: Updated schematic and or PCB Layout drawing)

sigcom1
 

Of course, simply subtracting a 3 MHz VFO from the 10 MHz USB
sideband generator used in the BITX20 would create a 40 meter signal
but it would not invert the sideband to LSB. This situation is the
same with any SSB generator that does not have capability of
selecting sidebands irregardless of the generator's suppressed
carrier frequency. In the case of 40 meters using the BITX's 10 MHz
sideband generator, to flip the sideband to LSB the VFO would need to
be -above- the sideband generator or 17 MHz. Example: A 1 KHz audio
tone into a 10 MHz USB generator results in a 10.001 MHz signal
(USB). Subtracting 3.0 MHz from 10.001 the resulting difference is
7.001 MHz, still USB. 17 MHz minus 10.001 equals 6.999 MHz (LSB).
However, a 17 MHz VFO might not be very practical so making the SSB
generator LSB or selectable sidebands would be a better way to go,
IMO.

73.......Steve Smith WB6TNL

--- In BITX20@..., Jim <n6otq@...> wrote:
Although BITX will work on almost any HF frequency as long as you do
your arithmetic. The convention for amateur radio is that
the "normal"
sideband assumes a 9 MHz filter and additive or subtractive
oscillators
to hit the ham bands. Anything mixed to above 9 MHz uses upper
sideband, and anything mixed to below 9 MHz uses lower sideband as
the
"normal" sideband.

Jim N6OTQ

--- Jim Tonne <tonne@...> wrote:


Jim n6otq wrote:

For a 40 MHz BITX
with a 10 MHz filter, use a 3 MHz VFO and take the subtractive
mixer
product.

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